请问这个具体怎么写呢

Question

#要根据集合有的功能编写一个类
#自定义集合。模拟Python内置集合类型，实现元素添加、删除以及并集、交集、对称差集等基本运算。

Answer 1

```python
class Cuset:
    def __init__(self,seq):
        self._cuset = set(seq)
    
    def add(self,elem):
        self._cuset.add(elem)
    
    def remove(self,elem):
        self._cuset.remove(elem)

    def __str__(self):
        return "{0._cuset!s}".format(self)

    def __repr__(self):
        return "Cuset({0._cuset!r})".format(self)

    def update(self,*others):#并集
        for new in others:
            self._cuset |= new._cuset
    
    def intersection_update(self,*others):#合集
        for new in others:
            self._cuset &= new._cuset

    def difference_update(self,*others):#差集
        for new in others:
            self._cuset -= new._cuset

    def symmetric_difference_update(self,other):
       
            self._cuset ^= other._cuset
    def clear(self):
        pass
    def pop(self):
        pass

a=Cuset([1,2,3,4,555,6,6,67])
b=Cuset(["a","b","c"])
d=Cuset([66,88,99,100,100,])

a.update(b,d)
print(a._cuset)

```